–First day of current week(sunday)
select TRUNC(SYSDATE, ‘Day’) from dual;
–First day of next week(sunday)
select TRUNC(SYSDATE+7 , ‘Day’) from dual;
–First day of previous week(sunday)
select TRUNC(SYSDATE-7 , ‘Day’) from dual;
–First day of current month
select TRUNC(SYSDATE , ‘Month’) from dual;
–First day of previous month
select TRUNC(TRUNC(SYSDATE , ‘Month’)-1 , ‘Month’) from dual;
–First day of next month
select TRUNC(LAST_DAY(SYSDATE)+1 , ‘Month’) from dual;
–First day of current year
select TRUNC(SYSDATE , ‘Year’) from dual;
–First day of previous year
select TRUNC(TRUNC(SYSDATE , ‘Year’)-1 , ‘Year’) from dual;
–First day of next year
select ADD_MONTHS(TRUNC(SYSDATE , ‘Year’),12) from dual;
– First Day of Current quater
select TRUNC(SYSDATE , ‘Q’) from dual;
– First Day of Previous Quarter
select ADD_MONTHS(TRUNC(SYSDATE , ‘Q’),-3) from dual;
– First Day of Next Quarter
select ADD_MONTHS(TRUNC(SYSDATE , ‘Q’),3) from dual;

–Last day of current week(sunday)
select TRUNC(SYSDATE, ‘Day’)+6 from dual;
–Last day of next week(sunday)
select TRUNC(SYSDATE+7 , ‘Day’)+6 from dual;
–Last day of previous week(sunday)
select TRUNC(SYSDATE-7 , ‘Day’)+6 from dual;
–Last day of current month
select LAST_DAY(TRUNC(SYSDATE , ‘Month’)) from dual;
–Last day of previous month
select LAST_DAY(TRUNC(TRUNC(SYSDATE , ‘Month’)-1 , ‘Month’)) from dual;
–Last day of next month
select LAST_DAY(TRUNC(LAST_DAY(SYSDATE)+1 , ‘Month’)) from dual;
–Last day of current year
select LAST_DAY(ADD_MONTHS(TRUNC(SYSDATE , ‘Year’),11)) from dual;
–Last day of previous year
select LAST_DAY(ADD_MONTHS(TRUNC(TRUNC(SYSDATE , ‘Year’)-1 , ‘Year’),11)) from dual;
–Last day of next year
select LAST_DAY(ADD_MONTHS(TRUNC(TRUNC(SYSDATE , ‘Year’)-1 , ‘Year’),-13)) from dual;
– Last Day of Current quater
select LAST_DAY(ADD_MONTHS(TRUNC(SYSDATE , ‘Q’),2)) from dual;
– Last Day of Previous Quarter
select TRUNC(SYSDATE , ‘Q’)-1 from dual;
– Last Day of Next Quarter
select LAST_DAY(ADD_MONTHS(TRUNC(SYSDATE , ‘Q’),5)) from dual;